The former Enyimba striker says the Super Eagles will qualify for the Africa Cup of Nations by beating the Lone Stars in the return leg
The former Enyimba player who is an intergral part of the Super Eagles said this after the 2-2 draw against the Liberians in Monrovia last weekend.
"I was on the bench for the Super Eagles all through the game in Monrovia and because I sat on the bench I saw how the Liberians played," Kalu told Goal.com.
"I am optimistic that we are going to win that game in Calabar and qualify for the Nations Cup in South Africa.
"I am not underrating the Liberians. They have a good side and can play good football. But we certainly have a better team in all ramifications.
"Super Eagles players know what is at stake and cannot allow this opportunity to pass us by. The fact that we did not attend the last Nations Cup in Equatorial Guinea and Gabon is the tonic that will propel us in this last game against Liberia.
"We can do it in Calabar and I am sure every player will be ready in October," Kalu said.
The Super Eagles will need at least a goalless draw in the return leg to qualify for the next Afcon in South Africa.